C# to Pascal converter C# Exercise - C# Programming Course

// Importing the System namespace to use basic functionality like Regex
using System;

class Program // Class definition in C#
{
    // Main method where the program execution begins
    static void Main()
    {
        // Example C# code to convert
        string cSharpCode = @"
using System;

class Program
{
    static void Main()
    {
        int x = 10;
        int y = 5;
        if (x > y)
        {
            Console.WriteLine(""x is greater"");
        }
        else
        {
            Console.WriteLine(""y is greater"");
        }
    }
}
";

        // Convert the C# code to Pascal
        string pascalCode = ConvertCSharpToPascal(cSharpCode);

        // Print the Pascal code to the console
        Console.WriteLine("Converted Pascal Code:");
        Console.WriteLine(pascalCode);
    }

    // Method to convert simple C# code to Pascal code
    static string ConvertCSharpToPascal(string cSharpCode)
    {
        // Remove 'using System;' line from C#
        // This line removes the unnecessary 'using System;' from the C# code
        cSharpCode = Regex.Replace(cSharpCode, @"using\s+System;\s*", "");

        // Convert C# class declaration to Pascal program declaration
        // This converts the C# 'class Program' to Pascal's 'program Program;'
        cSharpCode = Regex.Replace(cSharpCode, @"class\s+(\w+)", "program $1;");

        // Convert C# method declaration to Pascal method declaration
        // This converts the C# 'static void Main()' to Pascal's 'begin'
        cSharpCode = Regex.Replace(cSharpCode, @"static\s+void\s+Main\(\)", "begin");

        // Convert C# variables declaration to Pascal variable declaration
        // This converts C# declarations like 'int x = 10;' to Pascal's 'var x: Integer; begin x := 10;'
        cSharpCode = Regex.Replace(cSharpCode, @"int\s+(\w+)\s*=\s*(\d+);", "var $1: Integer; begin $1 := $2;");

        // Convert C# if-else block to Pascal if-else block
        // This converts C# 'if (condition) { ... } else { ... }' to Pascal's 'if condition then ... else ...'
        cSharpCode = Regex.Replace(cSharpCode, @"if\s*\((.*?)\)\s*{(.*?)}\s*else\s*{(.*?)}", "if $1 then\n$2\nelse\n$3");

        // Convert C# method calls like Console.WriteLine to Pascal WriteLn
        // This converts the C# method 'Console.WriteLine()' to Pascal's 'WriteLn()'
        cSharpCode = Regex.Replace(cSharpCode, @"Console\.WriteLine\((.*?)\);", "WriteLn($1);");

        // Add an 'end.' to complete the Pascal program
        // This adds 'end.' at the end of the Pascal code to indicate the end of the program
        cSharpCode = cSharpCode + "\nend.";

        // Return the final Pascal code
        return cSharpCode;
    }
}